LED lamps have progressed

Lightfair is the largest North American engineering lighting exhibition, every year in New York and two city tour, Wei Garth; 2005 Lightfair held in New York Jacob Javits Convention Center Exhibition Center, the exhibition area of over 110000 square feet, nearly 3000 booths, exhibitors from more than and 60 countries around the world, the exhibits range from all kinds of lighting products and spare parts, indoor and outdoor lighting, lighting system, optical simulation software to measurement technology. This paper will be divided into two parts, through the exhibition to see the future development of LED. LED electroluminescence light source, the earliest in 1907 Round discovered in 1960 by GE, and its commercialization. Early LED because the brightness is not enough, can only be applied to non visible light (infrared) or visible light transmission indicating two categories, but in recent years due to the blue LED and LED brightness increased dramatically, the application field of LED into the light. LED mainly by P type and N type semiconductor electron and hole in the active layer (Active Layer) after the combination of converts electrical energy into light released; and the active layer material changes (such as InGaN, AlInGaP, GaAs, etc.) can be led out of a variety of different wavelengths of electromagnetic wave, general the light wavelength and the active layer material can bring about (2 emiss=1239/Eg), the wavelength distribution from 400nm 700nm blue to red, rather broad range, greatly expand the application space of solid state lighting. LED used in lighting, in addition to the advantages of diversified colors, still have energy saving, small volume, long life (100 thousand hours), low pollution, high elastic module design space is wide, and many other advantages, so the major lighting manufacturers are optimistic about the future potential of LED, as the lighting industry star.

LED lighting landscaping and advertising billboards

LED is widely used, and its application in lighting, as shown in Figure 1, it is divided into architectural landscaping, advertising billboards, electronic devices, lighting, automotive lighting and indoor lighting and other parts, which reflect the time according to the technical standard and application are different, and the 2005 North American lighting exhibition exhibits focus on LED lamps architectural landscaping, billboards and indoor and outdoor lighting three parts, this paper respectively in the three areas of the LED lamps on display were sorted out and discussed.

LED light color pure, from short wavelength to long wavelength light blue, light blue, green and red color covers; so blue, green and red LED as the foundation, to color mixing can make many existing sources can not produce color and tone, make our life more colorful. It is because of this, LED has been widely used in advertising or building beautification; billboards in the application, Westing House product as an example, the use of Figure 2 (left) of the white light LED light emitting unit with flexible wires are connected as shown in Figure 2 (right) of the billboards, giving a sort of advertising Kanban shape or color larger design space for large screen advertising is the important standard of LED application, such as lightwild large color billboards for example, red, blue and green shells arranged LED with 4 inch spacing (Figure 3 left), the Kanban (right) Figure 3 shows a diversified the color, but through a different lens can change as shown in Figure 3 (right) a different picture effect.

As for the part of landscaping in the building, you can borrow LED decorative drab buildings more lively; last night, great buildings will be eclipsed many spectacular, although can use other light source lighting, but compared to the LED, the traditional decorative lighting design space and the performance is limited, and beautify the building of light source is a facelift LED, and general building landscaping with LED lamp, can be directly installed in the building shell or by using the projection lamp (Figure 4), let Wall Washing show the effect of building. TIR systems works in Tianjin, China, for example, the use of red, blue and green LED lamp with optical control, giving full moon tower diverse colors, as shown in figure 5. Another bridge is the key in LED decoration application of building landscaping, such as New York Broolyn bridge (Figure 6 left) and Taipei jenchi bridge (Figure 6 right) are a classic case, via LED landscaping, showing the vitality of buildings at night.

LED in addition to beautify building appearance, but also play an important role in interior design, using the advantages of multi color, expand the design changes; to Xenon Light in the North American Lighting Exhibition this year's award-winning products Squadro LED as an example, using Bluetooth or DMX control, the lamp body is pure lighting effect, as shown in Figure 7 the interior of the cube by acrylic mirror, made with red and blue green color LED, changing color according to the color sequence generator, with 8 kinds of color change speed, can change any color, make indoor landscape according to its color tone different taste.

In addition, LED light wall also has a good effect on the indoor visual presentation, such as Lightwild, pixel block LED products, light wall module dimensions were 12 x 12 or 24 x 24 inches, as shown in Figure 8 (left) shows, RGB LED color change device, mixed light generated as shown in Figure 8 (right) diverse color like.

In addition, LED small size is another advantage in the interior design, particularly in the application of the thin light, for use in landscaping products to Supervision SL1000 step, using the external Aluminum Alloy slip and weathering treated, collocation internal surface adhesion type monochrome LED (as shown in Figure 9. Left) shows, power 2.4W, the light is not the same feeling with the ladder, as shown in Figure 9 (right) shows.

LED expanded to outdoor lighting source

At present, the outdoor lighting is mainly used for high power mercury lamps or halogen lamps, compared to LED is more power consumption, and a shorter life expectancy